Razor strop



Apu-il 27, 1937.. K'HUMMELJIR RAZOR'STROP Filed March 4, 1956 INVENTUM@d JWM Patented Apr. 2'7, 1937 FFME RAZOR STROP Karl Hummel, Jr.,Karlsruhe, Baden, Germany Application March 4, 1936, Serial No. 67,040In Germany November 3, 1934 2 Claims.

For setting razors a plane or a convex or a concave setting surface isrequired according to the width and the concavity of the razors and tothe condition of their cutting edge. I-Iitherto it was necessarytherefore to have at hand always three or at least two raZor-stropshaving different setting surfaces. Now, the object of my invention is arazor-strop which is provided with a device by means of which it ispossible to give its setting surfaces one or the other of the said threeshapes according to requirement, so that always but one razor-strop hasto be at hand.

My invention is illustrated by way of example in the accompanyingdrawing in which Fig. 1 shows a whole razor-strop according to myinvention partly in side elevation and partly in longitudinal section onthe line l-I of Figure 2,

Fig. 2 shows the upper part of this razor-strop in longitudinal sectionon the line 2--2 of Figure 3,

Fig. 3 is a cross-sectional plan view taken on the line 3--3 of Figurel, and

Fig. 4 shows the lower part of the handle of this razor-strop cut awayin Figure l in longitudinal section. n v

`Each of the two leather-straps a lies on a flexible strip b of wood orother suitable material. And between these two strips' and parallelly tothe saine a tube c extends which may be of light metal, artiiicialmaterial such as Bakelite, or other suitable material and which iscomposed of two equal parts. Each of these parts is at one end providedwith a flange d, and both parts are connected together by screws epassing through both flanges, while each part at the other end carries arectangular plate f lying at right angles to the tube c and having twoflanges g. These iianges extend on both sides of and parallelly to thetube and eachA flange terminates in a joint-part h. To each end of thestrips b two joint-parts z' are screwed which are connected together byone of their two iianges and to the adjacent joint-part h by a joint-pink passing through them. The other ange of each joint-part i is in theform of a shoe in which one end of the respective strip b sticks. Theends of the straps a are bent around and riveted to those of the stripsb and to the shoe-shaped ilange of the parts i.

To the middle part and on the inside of each strip b a plate l isscrewed which has an arm 'nz extending inwards and rectangularly to saidplate and forming a rack. Both racks are guided on both sides of thetube c in corresponding recesses of the flanges d and gear into a pinionn lying in further recesses of the flanges. This pinion is fixed on thesquare upper end of a spindle o which is rotatably mounted in the lowerpart of the tube c and carries below the lower plate f the handle p. Thelower part of the latter (see Figure 4) has an enlarged boring, and onthe lower part of the spindle o a collar q, two nuts 1' and a helicalspring s are mounted; the latter presses the handle p close to the lowerplate f.

. A bush t (Fig. l) is xed in the upper end of the handle, 'while a pinu sticks in the spindle o; this pin engages by its ends in twolongitudinal notches of the bush t and thereby couples the spindle withthe handle in such manner that the latter is slidable on the formerlongitudinally. The bush t has a nose o which engages in a hole of thelower plate f; thereby the handle p together with the spindle o and thepinion n are secured against rotation in one or the other direction andthe racks m together with the plates Z are secured against movingoutwards or inwards, so that the strips b together with the straps aretain the even shape.

If, however, the handle p is pulled down, so that the nose o disengagesfrom the lower plate f, the handle p together with the spindle o and thepinion n can be rotated in one or the other direction. In the rotationof these parts the pinion n moves the racks m together with the plates Zoutwards or inwards, whereby the strips b together with the straps a arebent correspondingly and thus the two setting surfaces are curvedconvexly or concavely respectively, as indicated by broken lines inFigure l. If now the spring s is allowed to press again the handle pclose to the lower plate f, the nose o engages another hole of thisplate; thereby the parts Z, m, n, o and p are secured against movingback, so that the strips b and the straps a retain the curved shape.

What I claim as my invention and desire to secure by Letters Patent is:

l. In a razor-strop the combination of a rotatable handle, a tubeprovided with plates at both ends, said plates lying at right angles tosaid tube, two liexible strips hinged at each end to one of said plates,two straps of leather or the like lying on the outer side of said exible10 provided with a ilange at the inner end, said flange having threerecesses, two flexible strips hinged at each end to one of said plates,two straps of leather or the like lying on the outer side of saidflexible strips, means for simultaneously giving said two flexiblestrips and said two straps either a plane or a concave or a convex shapeaccording to requirement, said means comprising a spindle rotatablymounted in said tube and connected to said handle, a pinion fixed onsaid spindle and rotatably mounted in one of said recesses of each ofsaid parts and two racks each connected to one of said flexible stripsand guided on one side of said tube in one of said recesses of each ofsaid parts and each engaging from one side into said pinion, and meansfor securing said spindle against rotation.

KARL HUMMEL, JR.

